Abstract: The present invention relates to a device for fixing a picture tube having a lug on a shell of a screen, includes a threaded device, a prop device mounted on the shell of the screen for receiving the threaded device and fixing the lug of the picture tube thereon with said threaded device, and an adjusting device adjustably extending from a top of and confined by the prop device for compensating a space between the lug and the prop device thus fixing the picture tube through the lug. The present invention provides a cheap and easy-assembling fixing device for compensating space between picture tube and prop of the screen shell and well fixing the picture tube in the screen shell.